Those 4 will help flip the House. They give America a political symbol to fight against. The more Trump can bring them into focus, and the more democrats defend them. The stronger the republican party will do in the next election. It's all about the House of Representatives now.
Please be aware: When Trump goes on a rant and calls them out; he does so deliberately in order to provoke democrats into defending them. The gang of 4 has very low national approval ratings. When other democrats defend them against Trump it weakens overall support for democrats. Pelosi is smart enough to know; in order to get elected, democrats must lie about their true agenda. The gang of four is too naive to know it. Pelosi can't say that, but she desperately needs them to tone down their anti American rhetoric, and stop talking honesty about the democrat agenda. If the democrats hope not to lose seats in the 2020 election, AOC, Omar, Tlaib and Pressley must be brought to heel.