Virginia Governor Terry McAuliffe vetoed this week a bill that would have required an audit of voter rolls in several counties where more people are registered to vote than are eligible.

An investigation by Ohio’s Secretary of State reveals hundreds, and possibly thousands, of ineligible, but registered, voters.

Both states have something else in common.  They have U.S. Senate races in 2018.

With at least 10 Senate races looking like they could come down to several thousand votes, could Democrats hold on to 40 seats — allowing them to kill the Trump agenda through filibusters — due to voter fraud?

Democrats currently control 48 seats.  Forty-six are held by Democrats, and two held by independents who caucus with Democrats.

Twenty-three Democrats and both independents face re-election in 2018.

If nine lose their races, Democrats will fall short of the 40 seats they need to sustain a filibuster.

Coincidentally, the latest “Sabato Crystal Ball” rates nine of those races as either a toss-up, or where the Democrat is only slightly favored to win.

Should Trump’s approval ratings rise, Democrats will face even steeper odds.

With 25 seats at risk and only a nine-seat margin of error, that could leave Democrats relying on an old friend – rampant voter fraud.

Two current Democrat Senators, Minnesota’s Al Franken and Washington’s Maria Cantwell, narrowly defeated Republican opponents in races marred by accusations of voter fraud.

Former Louisiana Senator Mary Landrieu won her seat in 1996 amid similar circumstances.

Several 2018 Senate battleground states could prove to be hotbeds of voter fraud.

Ohio’s Sherrod Brown is among the most endangered of incumbent Democrats.

He earned only 50.7 percent of the vote in 2012.

Further investigation could likely yield enough duplicate registrations, dead voters and illegally-registered immigrants to outpace what could be a narrow margin of victory.

In Indiana, incumbent Democrat Joe Donnelly also won his seat with just 50.0 percent.

Should the election once again come down to a few thousand votes, it would be in a state where four people were recently convicted of mass voter fraud that helped put Barack Obama, Hillary Clinton, and John Edwards on that state’s Democrat presidential primary ballot.

In North Dakota, incumbent Democrat Heidi Heitkamp won with only 50.2 percent, winning by less than 4,000 votes.

North Dakota does not require voter ID, and a 2004 Senate race was decided by only 4,508 votes, amid allegations of rampant voter fraud.

In Florida, incumbent Democrat Bill Nelson is among the most endangered of Senators.

He won the seat in 2000 with just 51.0 percent, and won re-election in 2012 with just 55.2 percent.

Elections in 2012, 2013 and 2014 resulted in convictions for voter fraud, and with large inner cities in Miami, Orlando and Tampa, there are tens of thousands of opportunities to engage in voter fraud – especially in a state best known for a presidential election decided by less than 700 votes.

In Montana, incumbent Democrat Jon Tester slipped into the Senate with only 49.16 percent, beating the incumbent Republican by less than one percent.

His 3,000-vote margin of victory could be easily replicated with ballot-stuffing at Democrat-run Indian reservations.

In Virginia, incumbent Democrat Tim Kaine faces a tough race.

He could draw a strong Republican challenger in Carly Fiorina, and 2006, 2013 and 2014 statewide races were decided by very narrow margins.

Investigators have found evidence of voter fraud in Virginia Beach, the state’s largest city.

In Wisconsin, incumbent Democrat Tammy Baldwin won her seat in 2012 with only 51.4 percent.

With large numbers of inner-city voters in Milwaukee, and large numbers of college voters in Madison, along with statistical anomalies in 2016 voting totals, a narrow Senate race could be decided by ballot-stuffing and fraudulent registrations.

In Maine, incumbent independent Angus King took his seat with just 52.9 percent, taking advantage of a split opposition with both Republican and Democratic opponents.

He will likely face current Republican Governor Paul LePage, who can raise money nationally to wage a strong challenge.

Maine laws allowing people to register to vote on Election Day have led to past allegations of mass voter fraud, and provide Democrats ample opportunity to manufacture votes on the spot.

Voter fraud is generally not a problem in the United States, but when elections are decided by only a few hundred votes out of hundreds of thousands, or millions, cast, voter fraud can easily decide a race.

And should Democrats teeter near 40 Senate seats, just a few hundred fraudulent votes in a too-close-to-call state could decide whether Trump’s agenda will be enacted – or blocked with an illicitly-gained filibuster.