2016 Presidential Race

Supporters of Bernie Sanders' presidential campaign have been calling, emailing and tweeting so-called superdelegates who back Hillary Clinton, to try to convince them to switch sides.

Bernie Sanders plans to attend a Vatican conference about social, economic and environmental issues next week. Sanders says he's a "big, big fan of the pope" for "talking about the idolatry of money."

A look at claims about the fossil fuel industry, lobbyists, superPACs and the Clinton campaign.

Ted Cruz and Bernie Sanders had big Wisconsin wins, but they were also fairly predictable based on demographics. Do demographics suggest Wisconsin was an outlier or a turning point?

Trump demands that Mexico pay up to $10 billion or risk the cutting off of wire transfers from the U.S. to Mexico and a cancellation of business and tourist visas for Mexican citizens.

Trump has gone on the attack against Wisconsin Gov. Scott Walker in his home state this week. But that could be a big political miscalculation heading into Tuesday's primary.

Sanders and his supporters are trying to change America, not the positions of another candidate. But his issues are helping to define the Democratic primary.

Donations linked to the oil and gas industries equal two-tenths of 1 percent of Clinton's overall fundraising.