by BETH FOUHY
Conservatives have pulled advertising dollars out of Pennsylvania and Michigan and instead are focusing their money on less costly toss-up states.
Independent groups are spending nearly $13 million in the coming days to counter President Barack Obama's nominating convention in hopes of limiting any improvement he might see in polls.
But conservatives' hopes of expanding the playing field for Republican presidential nominee Mitt Romney are on hold for the moment, according to consultants who track spending on political ads.
"Over the last several weeks, the dynamics have been changing in a number of states that have led us to dedicate resources elsewhere," said Jonathan Collegio, a spokesman for American Crossroads, a super PAC advised by George W. Bush political guru Karl Rove.