Udall and Gardner spar in Denver Post debate tonight

Keep an eye out for these four points during tonight's debate. 

Lynn Bartels --- The Denver Post 

Democrat Mark Udall and Republican Cory Gardner square off Tuesday night in a Senate debate sponsored by The Denver Post.

It will be the third time the senator and his challenger will debate. Here are four things to watch for:

Evasion. When Gardner has been asked about his position on certain social issues, at times he has ignored the question and instead referred to Udall’s record. At a debate Monday, when Udall declared his support for a carbon tax, he didn’t answer Gardner’s questions about the price the senator would put on carbon.

Humor. Gardner’s known for his quickness and his one-liners but it was Udall who unwittingly got a big laugh in their first debate when he said he’s the last person the White House wants to see walking across the lawn.

Fireworks. Obamacare, the government shutdown, illegal immigration, the questions are sure to bring strong responses. Sen. Ted Cruz, billed by the Udall camp as Gardner’s partner in crime, might come up, too.

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