In shirt sleeves, President Barack Obama waves to UNLV students as he begins his speech on the economy and college affordability. He announced a plan to cap student loan payments at 10% of payees discretionary income. (Photo taken by CBS News’ Mark Knoller)

In shirt sleeves, President Barack Obama waves to UNLV students as he begins his speech on the economy and college affordability. He announced a plan to cap student loan payments at 10% of payees discretionary income. (Photo taken by CBS News’ Mark Knoller)

Tags: mark knoller barack obama UNLV Campaign 2012 eye on the white house rally