Sen. Jon Tester (D-Mont.) has announced that he will join Sen. Joe Manchin (D-W.Va.) and all 50 Senate Republicans to strike down President Joe Biden’s private sector vaccine mandate. “I’m not crazy about mandates,” Tester said on Tuesday, though he added that he supports mandates aimed specifically at health care workers and military servicemen. Tester, a moderate Democrat in the upper chamber, is the second Democrat to announce that he will join Republicans in striking down the mandate using a 1990s oversight law. Sen. Joe Manchin announced his decision on Dec. 3, saying that he would support Republicans in their effort to strike down the private sector mandate. Manchin explained the decision in a statement, “I have personally had both vaccine doses and a booster shot and I continue to urge every West Virginian to get vaccinated themselves.” Still, the senator emphasized his opposition to any effort to impose vaccination …