* "Let's rebuild this country," president says
* Unclear if Congress will support proposals
President Barack Obama walked into the mouth of a giant tunnel in Miami on Friday to highlight proposals to boost investment in U.S. infrastructure, a move designed to show a leader still focused on the economy in the midst of broader policy battles in Washington.
Obama's tour of the Port of Miami tunnel project and a subsequent speech were aimed at convincing members of the U.S. Congress to back proposals that would leverage taxpayer dollars into funds to rebuild American roads, bridges and other infrastructure.
"My main message is, let's get this done," he said. "Let's rebuild this country that we love."
Obama, as he has in the past, said he wanted to develop a national infrastructure bank and capitalize it with $10 billion. The idea is to pull in private-sector funding and pick projects based on merit.
He would also create "America Fast Forward Bonds" that would help state and local governments attract money for infrastructure projects. These would be direct subsidy bonds in which the issuer would receive a 28 percent subsidy of the borrowing cost as a way of attracting a wider set of investors.
In addition, Obama would add $4 billion to support two programs that are used to provide grants for infrastructure projects like the Miami tunnel.
It is unclear how far the proposals will go in Congress. Republicans are reluctant to support what they consider government stimulus spending after a much criticized $787 billion stimulus plan that Obama managed to push through Congress in 2009.
The president noted that some people on both sides of the political spectrum, such as labor unions and the Chamber of Commerce, had supported his infrastructure ideas.
"Building bridges and schools, that's not a partisan idea," he said.
Obama was criticized in his first term for focusing too much on his signature policy goal of revamping the U.S. healthcare system, which critics said resulted in him giving less attention to the slow economic recovery.
The White House rejects that charge.
Since his re-election in November and his January inauguration, Obama has steered a policy push focused primarily on passing both immigration reform and tighter gun control measures.
However, his State of the Union address in February included a series of measures to boost the economy, and the Florida trip fleshed out some of those ideas.
Alan Krueger, Obama's chief economist, told reporters traveling with Obama on Air Force One that the three main proposals outlined by the president would cost some $21 billion but that cuts would be made elsewhere to avoid increasing the budget deficit.
Obama's fiscal 2014 budget proposal, which will be released on April 10, would spell out how they are paid for, he said. All of the proposals require congressional approval.
Although Obama will not run for re-election again, Florida is still important for him and his fellow Democrats. The political swing state backed the president in 2012 and will be critical to determining whether a Democrat holds on to the White House or whether a Republican recaptures it in 2016.
The White House believes an increase in infrastructure investment would make the United States more competitive while providing a boost to the construction industry, which is still suffering high levels of unemployment.