Hillary Clinton defended her record of email use on CBS’ “Face the Nation” on Sunday. It was reported last week that she had instructed staffers on how to send confidential information through unsecured channels. Clinton argued that there was often lots of unclassified information that could be sent unsecured. Clinton says that the staffer, who is now working on her campaign, never ended up sending out the information in question, which were a set of talking points for a phone call.

The Sen. Bernie Sanders and Hillary Clinton campaigns have started to engage in increasingly strong attacks on one another. In response to Clinton’s claims that Sanders’ stance on guns is at odds with President Obama’s planned executive orders, Sanders said that it shows that Clinton is getting “nervous” and “panicky.” He also pointed out that in 2008, Obama portrayed Clinton as too supportive of gun rights.

Earlier this week, Trump described a voting system in this country that he believes is “out of control.” In his opinion, people are voting “many, many times.” He added: "They don’t want security, they don’t want cards.” He made the allegations in front of a crowd in New Hampshire, despite the fact that studies point to a tiny number of cases of voter fraud.

It’s been reported that Bernie Sanders volunteers often reach out to potential supporters before the campaign staff get on the ground. With a new app called “Field the Bern,” canvassers can organize voter data as they go door-to-door without any help from campaign offices. The app was developed at a time when the Sanders campaign has struggled to keep up with the exponential growth in total numbers of volunteers, which now stands at around 400,000.

Hank Greenberg, architect of the once bailed-out financial giant AIG, has donated $10 million to Jeb Bush. What is increasingly unclear, is whether continuous injections of cash can actually sway voters' opinions. Right to Rise, the super PAC that Greenberg gave the money to, has already spent $47 million on Bush ads, way more than any other entity, and with very little to show for it.

Texas Senator Ted Cruz, leading in the Iowa GOP primary polls and occupying second spot nationally, has taken aim at the Southern states. In December, he attended just three events in Iowa and didn’t even appear once in New Hampshire. He did, however, attend 10 events in the South, excluding South Carolina.

Candidate for president in 2012 and former New Mexico governor Gary Johnson has announced that he will seek the presidency as a libertarian once again. He began the last cycle in the Republican primary race, but decided to mount a libertarian bid in the general. He received just under 1% of the vote last time around.

Moving away from traditional political advertising that presents candidates' families and stories of success, Donald Trump has gone straight “for the jugular" in his first spot, a Hollywood PR guy tells The Wrap. Conservatives in the media industry say the ad works perfectly to engage voters already interested in what Trump's saying.

Finally, someone has brought up the fact that Ted Cruz was born in Canada. Who better than the original birther himself, Donald Trump? Trump told the Washington Post that he believes Cruz’s foreign birth could land him in court. Cruz renounced his Canadian citizenship years ago and his mother is American. The specific issue, however, has never been tested in court.

Iowa Republican power-broker Cameron Sutton is expected to be named the new co-chair of Sen. Marco Rubio’s Iowa team. The move comes as we get closer to the Iowa caucuses, where the Rubio campaign needs a strong showing. Sutton previously worked as Sen. Joni Ernst’s state director in Iowa, following her election to the U.S. Senate.