The Huffington Post’s Michael Calderone writes about Politico in the site’s iPad-only magazine “Huffington.” As we have noted over the last few months, Politico has been expanding its video efforts, particularly on big election nights.

Calderone reveals that in 2010 the site wanted to launch its own Sunday public-affairs show, anchored by Mark Halperin, a Time columnist and MSNBC regular. You can download Huffington. from iTunes here if you want to read the entire thing.

So far no online startup has dared challenge the broadcast or cable networks on Sunday mornings, but as more and more people watch video online, that will surely change. The Wall Street Journal launched its own weekday show from Washington recently, and HuffPost has its own plans in the works with HuffPost Live.