"This is an anti-Washington year," conservative columnist and ABC News contributor George Will said. "How do you get more Washington than a three-term senator who occupies the seat once held by his father, a four-term senator, who before that worked on the Senate staff and then as a lobbyist in Washington? He's a wonderful man and a terrific senator, but the fact is, he's going against terrific headwinds this year, and he cast three votes, TARP, stimulus, and an individual mandate for health care.
"Now, you might like one, two or all three of those, but being opposed to them is not outside the mainstream of American political argument."
Author Avlon said, "If they stay on fiscal issues, they can have a real impact on this election. There's no question. They have been able to channel voter anger into something that is genuinely grass roots not Astroturf."
There have been predictions for months that the Democrats will take a big hit in the midterm election, but the ouster of Bennett shows that incumbents in both parties should be worried.
"Just because you have an 'R' next to your name doesn't mean you're safe this year," said Ramesh Ponnuru, a senior editor for National Review magazine.
But even with a Utah victory, and Palin's support, the Tea Party movement still faces significant challenges. A recent ABC News/Washington poll published May 5 showed that of the 27 percent who support the Tea Party movement, only 17 percent "strongly" support it, and only 2 percent say they're "active participants."
"They are going to need to show if they can actually beat Democratic incumbents and actually beat Republican incumbents -- and sort of put the fear of God into the party a little bit -- and that the activist base is a force to be reckoned with, not just to be used to advance the party's chosen candidates," Politico's Alexander Burns told ABC.
ABC News' David Kerley contributed to this story.