How bad would a Grexit be for America?

The overwhelming "no" vote pushes Greece closer to a potentially messy exit from the eurozone common currency union. It also sets up possible global market chaos and presents a fresh headache for the White House, which has had little success pushing for a deal that would prevent a Greek exit.Some in the administration fear that if Greece leaves it could lead to the eventual collapse of the entire eurozone, a destabilizing event that could crush markets and damage a U.S. economy that is growing at only around 2 percent a year and is vulnerable to outside shocks. [Politico]