Possible contenders to replace Biden President Joe Biden’s halting debate performance has led some in his own Democratic party to begin questioning whether he should be replaced on the ballot before November Kamala Harris, 59 Vice-president Most obvious choice for party to install as replacement, but poor polling ratings raise concerns that she could lose against Trump Gavin Newsom, 56 California governor President’s most effective and telegenic surrogate, has long appeared to be running shadow campaign as Biden’s backup J.B. Pritzker, 59 Illinois governor Member of family which owns hotel chain Hyatt, is estimated to be worth $3.6bn, making him richest politician in U.S. Gretchen Whitmer, 52 Michigan governor Shortlisted for Vice-president pick for Biden in 2020, she is seen as one of leaders of moderate wing of Democratic Party in post-Biden era 1 2 3 4 5 6 Others include Transportation Secretary Pete Buttigieg (1), Maryland Gov. Wes Moore (2), Pennsylvania Gov. Josh Shapiro (3), Colorado Gov. Jared Polis (4), Kentucky Gov. Andy Beshear (5), and Senator Sherrod Brown (6) Sources: AP, Reuters, Bloomberg, Forbes Pictures: Getty Images © GRAPHIC NEWS