Republican presidential candidates are heading into a busy weekend of campaigning ahead of next week’s crucial “Super Tuesday” primaries. The 10 states holding votes on Tuesday are worth 437 delegates, more than the total number of delegates elected in the two months of the race so far. On Thursday, Rick Santorum took aim at Mitt Romney for negative campaigning, while Newt Gingrich said he was the best candidate to defeat what he called President Obama’s “socialist, bureaucratic, secular” agenda.

Rick Santorum: “That’s how one candidate has been able to win the race, not by painting a positive agenda, but by just serially destroying, with negative ads, their opponent. Good luck doing that in the general election. It’s not a winning formula. What’s a winning formula is having better ideas, motivating the base of the Republican Party, being authentic.”

Newt Gingrich: “We have two nice people running who are not visionaries. We have a president who has the wrong vision. And so, we need to match our positive vision of an American future with his negative vision of a socialist, bureaucratic, secular future.”