Americans are dissatisfied with both major political parties, but the public's approval of the Democratic Party is at its lowest level ever, a new CBS News poll shows.

Favorable views of the Democratic Party dropped 20 points in the past year to 37 percent, according to the poll, conducted May 20 - 24. Last month, the party's favorability rating stood at 42 percent.

Fifty-four percent of Americans have a negative view of the Democrats, the poll shows.

Republicans have a similarly low favorability rating at 33 percent. That figure, however, is up from 28 percent - the historic low the party received last June. Fifty-five percent of Americans have a negative view of the Republican Party.

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Seventy-seven percent of Americans now disapprove of the way Congress is handling its job - the highest ever in a CBS News poll.