Sen. Cornyn unsure of tax issue potency

"It's hard to know what the issues are going to be in 2012," Cornyn, who heads the National Republican Senatorial Committee, told The Ballot Box. "But I dare say taxes and spending will always be an issue."

The compromise extends all the current Bush-era tax rates for two years. Cornyn called the deal "genuinely a bipartisan proposal."

"I hope it's the start of a new trend," he said. 

Cornyn used a more partisan tone in a fundraising e-mail Tuesday.

"President Obama's decision yesterday to join with Republicans in opposing the largest tax increase in American history was made not because he had a sudden change in political or economic philosophy," the senator wrote to supporters of the NRSC.