The Traitwise-made poll can be run simultaneously from multiple locations. A few surveys were completed as a result of very light promotion on Google and Facebook. No evidence of any problems so far.
Polling and Opinion Research
Visualizing Political Polarization in the USA
This interactive graph published by the Pew Research Center, tells a couple of important stories about the political mood in the Untied States. Neither is a big surprise. One is that the parties are more polarized, especially among the politically active. The second is that the country as a whole is not polarized (though not coalescing around an ideological consensus either), and tends to be moving slightly left overall.
Matthew Dickinson at Politico has a good analysis.