HOUSTON — The Texas lawsuit asking the U.S. Supreme Court to invalidate President-elect Joe Biden’s victory has quickly become a conservative litmus test, as 106 members of Congress and multiple state attorneys general signed onto the case even as some have predicted it will fail.The last-gasp bid to subvert the results of the Nov. 3 election is demonstrating President Donald Trump’s enduring political power even as his term is set to end. And even though most of the signatories are far-right conservatives who come from …