Gingrich blasts Santorum as ‘pal’ of unions in new robocall

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The call goes on to insinuate that Santorum is a “pal of the union bosses.

Gingrich has focused the brunt of his attacks on Mitt Romney so far in the campaign, but Santorum’s wins in Colorado, Minnesota and Missouri have elevated him to a status as Romney’s chief competitor. Gingrich needs the vote of social conservatives who might otherwise be inclined to vote for Santorum to pick up enough delegates through Super Tuesday to maintain a shot at the nomination.

Santorum, for his part, has defended his vote against the federal right-to-work law as intended to preserve states’ rights.

“When I was a senator from Pennsylvania, which is a state that is not a right-to-work state, the state made a decision not to be right-to-work, Santorum said during a January GOP debate in South Carolina. “And I wasn’t going to go to Washington and overturn that from the federal government and do that to the state.

The most recent polls of both Tennessee and Oklahoma show Santorum with double-digit leads, although those states have not been surveyed since Romney’s victories in Michigan and Arizona earlier this week.