Ted Cruz undeniably secured a spot in the annals of senatorial theatrics at the stroke of noon Wednesday, when parliamentary inevitability required him to yield the floor after 21 hours and 19 minutes. Other than applause from a modest collection of fellow Republicans, did he gain much of genuine worth for his considerable talk-a-thon troubles? The ledger of political costs and benefits looks close to impossible to push toward balance. Not so for his likely presidential rivals, Rand Paul and Marco Rubio, whose mastery of the Senate juggling act looks pretty good by comparison. (more…)