WASHINGTON — Mary Rafferty got married in June, but she’s delaying her honeymoon until after Election Day for a not-so-tropical getaway: an air bed in Denver that lets her knock on doors in support of Democrat Mark Udall and his re-election campaign.

Walking a similar beat is Rudy Zitti, a former Long Island police officer who’s making the rounds for the conservative group Americans for Prosperity and its goal of limited government.

The two activists are among the hundreds of political foot soldiers expected to flood Colorado neighborhoods ahead of the Nov. 4 election.

While invasions of this kind are nothing new, several factors are converging on Colorado this year that could make the state home to the fiercest “ground war” in the country.

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