Extreme positions are not succeeded by moderate ones, but by contrary extreme positions.
Politics is a like physics. Whatever goes up has to come down a little bit.
Referring to a large increase in the polls:
It [is] natural that in the vibration of the political pendulum, it should go from one extreme to another.
I fear that, as conditions worsen, many will react to the failures of too much government by calling for even more government. Then there will be more and more lifeboats launched because fewer and fewer citizens know how to swim. Unlike some pendulums, political pendulums to not swing back automatically; they must be pushed. History is full of instances when people have waited in vain for pendulums to swing back.
Politics is pretty much an up and down business
If the pendulum swings, it may swing to a combination of Conservatives and Liberal Democrats and, thus, to a period of minority government or coalition, in some form.
The Democratic and Republican parties each operates as a necessary counterweight in a partnership designed to keep the pendulum of power swinging in perpetuity from the one set of colluding quislings to the other, and back.
Politics is cyclical.
The truth is that for a Democrat to triumph in a presidential election, it needs to come on the heels of 'the dark times' of an unpopular Republican administration. Carter followed the Nixon era, Clinton succeeded after 12 years of Reagan/Bush, and Obama was a direct result of eight years of Bush/Cheney.
Perhaps America works like this: Presidencies swing, as reactions to each other, like a pendulum. My optimistic belief is it is how we keep our country in balance.