Wall Street’s Democrats are lining up behind Kamala Harris with a mixture of relief and genuine enthusiasm for a politician many of them supported in 2020. Finance executives’ money and convening power between now and the Democratic convention will be key to Harris’ plans to “earn and win” her party’s nomination. Several donors said Sunday they were prepared to break out checkbooks that had sat untouched since Joe Biden’s debate performance. Among those expected to aid Harris’ bid for the...