Clinton was in Iowa Tuesday. REUTERS/Rick Wilking

MOUNT VERNON, Iowa -- Newly-minted presidential candidate Hillary Rodham Clinton rolled into this quaint hamlet billed as "America's Coolest Small Town" on Tuesday afternoon, drawing scores of excited onlookers and promising to roll out a series of policy proposals in the weeks to come.

In a brief interview with The Washington Post, Clinton said she had developed a plan to overhaul the way money is spent in political campaigns. Earlier in the day she said she wanted to fix the country's "dysfunctional" campaign finance system, even backing a constitutional amendment if necessary.

Asked about her campaign finance agenda, Clinton said, "We do have a plan. We have a plan for my plan."

Clinton added, "I'm going to be rolling out a lot of my policies...Stay tuned."

When The Post asked about the role of Priorities USA Action, a pro-Clinton super PAC currently trying to raise hundreds of millions of dollars to help her campaign, Clinton shrugged her shoulders and said, "I don't know."

Then the candidate walked into Fuel Espresso, a coffee shop that advertises it sells "mom's baked goods from scratch," for a private meeting with supporters. Clinton's campaign ad makers, including chief media strategist Jim Margolis and a crew of cameramen, followed her into the shop.