"Hope" is an evocative word, as well, in current times, as strongly linked to, even a symbol for, Obama and his campaign. Here it is shown being thrown overboard.
While the Boston Tea Party is an important piece of American revolutionary history, I'm not sure whether the use of it here is supposed to give positive connotations. One thing is clear, though- the Tea Party took place in Massachusetts, the state which recently elected Scott Brown, a republican who promises to try and block the health care reform bill, to the senate seat previously belonging to Edward Kennedy. Brown is the first republican to be elected to the Senate from Mass. since 1972. He brings the number of Republicans in the Senate up to 41. Fittingly, one of the main concerns people mention about Obama's health care reform plan is the amount of money that would be spent- and the increase of taxes.