Donald Trump is basking in his new support from Sarah Palin, while Hillary Clinton and Bernie Sanders are touting their military strength in new TV spots. Josh Robin wraps up the day on the presidential campaign trail in the following report.

A year from now, President Barack Obama leaves office. He marked the milestone by talking up the auto industry's comeback after his administration bailed it out.

"The reason I want to remind people is not because I'm on the ticket, it's because I want America to have confidence in where we can go," Obama said.

Without naming names, Obama says Republicans are peddling pessimism.

The Republican who is leading in national polls stumped again with Sarah Palin, who addressed her son's recent domestic violence arrest by blaming Obama's lack of support for veterans. Track Palin served in Iraq.

"It comes from our own president," Palin said. "They have to look at him and wonder, 'Do you know what we go through? Do you know what we're trying to do to secure America and secure the freedoms?'"

Trump saved perhaps his most colorful line not for Obama or fellow Republicans or even the Democratic front-runner, but on Bernie Sanders, who is gaining on Hillary Clinton.

"This guy, he's a whack job, he's a wacko, he's beating Hillary Clinton. Oh boy," Trump said. "I tell you, I really want to run against her, but I really want to run against Bernie Sanders."

Not quite as overtly, a new Clinton ad calls attention to her experience, perhaps to note Sanders as inexperienced.

"The senator who helped a city rise again, the secretary of state who stood up for America and stared down hostile leaders around the world is the one candidate for president who has everything it takes to do every part of the job," the ad says.

Sanders is countering with his own steely ad. It also does not mention his opponent, but it stresses that he voted against the war in Iraq.

"We must never forget the lessons of that experience. ISIS must be destroyed, but we must not do it alone. We need an international coalition with Muslim boots on the ground fighting with our support. It's time to end the quagmire of perpetual war in the Middle East," he says in the ad.

In a softer side showing national interest, Sanders is also profiled in People Magazine. Of note: he proposed to his wife after ice cream sundaes at Friendly's.