Conservatives have their best chance yet to oust Senator John McCain.

Grassroots activists recruited a strong primary challenger in Arizona State Senator Kelli Ward.

And the moves made by McCain’s campaign show he believes he could lose.

McCain has built his reputation as a compromise-oriented Republican.

He has supported liberal priorities such as government restriction of political speech, gun control and amnesty for illegal immigrants.

Conservative activists’ anger increased with each deal he supported that sold out their values.

And recent polling shows McCain is in trouble.

A May Public Policy Polling survey found only 35% of Republican voters approved of his job performance.

In contrast, 50% of Arizona Republicans disapproved of McCain.

Additionally, the poll found just 39% of Republicans supported McCain in a primary contest.

In 2010, when McCain faced a primary challenge, he flip-flopped on his stance on amnesty and campaigned on building a border fence.

In this election, McCain has decided to pin his re-election hopes on opposing ObamaCare.

But McCain’s checkered history of fighting the law could be his undoing.

When Barack Obama and the Democrats shut down the government rather than sign a Republican budget that defunded the law, McCain sided with Obama and against conservatives.

The Huffington Post reports:

In an interview with Fusion’s Jorge Ramos on Thursday, McCain slammed the shutdown as a “miserable failure.”

“I said it couldn’t succeed from the start and it didn’t,” he said. “It was a miserable failure and we must never do it again.”

When asked about Tea Party Congressmen like Sens. Ted Cruz (R-Texas) and Rand Paul (R-Ky.), who led the anti-ObamaCare efforts that caused the shutdown, McCain said they’d be “held accountable” for the move that furloughed hundreds of thousands of government workers, closed national parks and halted clinical trials helping desperately ill patients, among other things.

“Those responsible for it will be held accountable by the American people and I don’t care what party they are in,” McCain said.

McCain made similar comments before, blaming the shutdown on the Tea Party and saying it started “on a fool’s errand.”

Conservatives argued that the shutdown was Republicans’ opportunity to stop ObamaCare before the law came online.

That was because the first sign-up period began on October 1, 2013.

After that date, Americans would begin to receive subsidies to purchase health insurance.

ObamaCare opponents, led by Senators Ted Cruz and Mike Lee, believed once government money began to flow into the pockets of Americans, it would be more difficult to repeal the law.

But McCain fought them at every turn.

Now McCain is trying to hide his opposition to ObamaCare and run millions of dollars in TV ads presenting himself as the law’s chief opponent.

Is this a sign of strength — or a desperate move because he is in serious trouble in his primary?