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Paul and Santorum are both attempting to paint themselves as the conservative alternative to Mitt Romney in the Iowa caucus, but deep ideological differences — especially on foreign policy — have sharply divided the Republican competitors.

Earlier this weekend, Santorum blasted Paul for negative robo-calling and his foreign policy platform.

“Just on the issue of commander in chief, he comes from the Dennis Kucinich wing of the Democratic Party, which is not a place where I’d want my commander in chief to be,” Santorum said on MSNBC. “The problem is Barack ObamaBarack ObamaTrump to attend Army-Navy football game Obama urges Congress not to repeal ObamaCare President Obama should curb mass incarceration with clemency MORE in his second term, I fear, would not be much better.”

The Paul campaign, meanwhile, touted Tuesday the endorsement of one of Santorum’s nephews.

“Santorum’s 19-year-old nephew John Garver writes in the Daily Caller all about how his uncle’s longstanding, misplaced insecurities cause him to doubt how economic and civil liberties will help America reach its potential — if those like Santorum just step aside and permit them to,” the Paul campaign wrote in a news release.