A convention bounce or convention bump refers to an increase in support that U.S. presidential candidates in the Republican or Democratic party typically enjoy after the televised national convention of their party. A presumptive nominee for president may also be said to experience a "VP bounce" after announcing his or her pick for vice president prior to the convention. The size and impact of convention bumps vary, but presidential candidates usually see at least a small uptick in their polling numbers coming out of their conventions.