The Politico Caucus is out this morning, a weekly look at the campaign by political insiders in the early states of Iowa and New Hampshire. The leadoff today suggests real estate magnate Donald Trump’s candidacy is primarily impacting Texas Sen. Ted Cruz, with New Jersey Gov. Chris Christie and Wisconsin Gov. Scott Walker also having their candidacies diminished:

Insiders: Ted Cruz hurt most by Trump candidacy

Donald Trump’s turn in the national spotlight is mainly taking a toll on Ted Cruz, the …