The Club for Growth is wasting no time. It has already issued a press release denouncing Tom Davis:

Before Tom Davis even entered Congress, he was already to the left of his Republican colleagues, telling the Wall Street Journal that spending cuts “may get out of control” (12/19/94).  Unfortunately, little changed over his thirteen years in Congress.  His record is riddled with anti-growth votes, from his support for out-of-control government spending, his fondness for increased government regulation, and his bristling hostility for political free speech and property rights….

"Tom Davis has one of the most economically liberal records among Republicans in the House,” said Club for Growth President Pat Toomey.  “Since Republican voters in Virginia are decidedly economic conservatives, it’s hard to see how Davis could win a statewide primary.”

Do I sense a Draft George Allen movement brewing?