Republicans roundly mocked President Joe Biden on Monday for doing a “Morning Joe” interview by phone on MSNBC in which he defiantly vowed to stay in the presidential race. Biden, who is said to watch “Morning Joe” every morning, called into the show to renew his pledge after a total of nine Democrat lawmakers reportedly called for his resignation. “They’re big names! But I don’t care what those big names think,” Biden said when asked about his opposition. “I’m getting so frustrated by the elites … the elites in the party.” “All the data, all the data shows that...