Approaching the 19-hour mark of Sen. Ted Cruz's marathon (and still going) Senate floor speech against Obamacare, the Texas Republican showed little sign of strain -- except for one small change.

Sometime around 9:30 a.m., he loosened his tie.

Approaching 19 hours on the Senate floor, Ted Cruz finally loosened his tie sometime between 9:10 a.m. and 9:32 a.m. (Image source: C-SPAN)

It's not clear when precisely it happened -- Cruz began entertaining a question from Oklahoma Republican Sen. James Inhofe around 9:10 a.m. -- but the tie was loosened by the time the camera panned back to him at 9:32 a.m.

See the before and after below:

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