East Germany has a lower population than West Germany so this doesn’t fully translate to a 50-50 split. I think overall national polls put the AfD at 27%, ahead of the CDU which is at 24%. SPD is now in a distant third place. The trend over the past years has been in favor of the AfD and further growth is to be expected. This growth will come at the expense of the CDU more than any of the other parties, as it is CDU voters and non-voters who are most likely to switch over to the AfD. The CDU will then probably enter into coalition with the AfD when they can no longer form a government otherwise, unless the SPD somehow manages to miraculously recover. It’s either that or they ban the AfD.

Yes. This is correct. The liberal ideological conditioning has not had as much time to become firmly rooted in the minds of East Germans as it did in the West.
Unfortunately, since the ideological rug was pulled out from under the East Germans with the annexation (really a hostile takeover) of the GDR, this left them floundering and groping in the dark for ideological alternatives. And though the aggressive “de-communization” campaign waged in the East, not only economic through sweeping privatization but also with an aggressive rewriting of the educational curriculum and a blacklisting of socialists in academia, government and media, tried very hard to reprogram the people to buy into the dominant liberal ideology, it did not fully succeed, especially where the ideology clashed with the lived reality.
On the one hand this means that they are more open to anti-hegemonic, anti-imperialist, anti-capitalist alternatives, but on the other hand the profound shock and economic trauma of the “re-unification” has also opened up the door to resurgent far right ideology, ironically imported from the West of Germany where Nazism was kept alive throughout the Cold War.
It also definitely doesn’t help that economic conditions are still much worse in the East after the GDR’s industries, many of which were acquired by West German capital, were looted and dismantled after the annexation, at the same time as the previously existing robust social safety nets and social guarantees were replaced with much more meagre alternatives. For all the high-minded rhetoric about “cheerful re-unification of a divided family” the reality was more akin to one country losing a war and being conquered and plundered by another. The meagre attempts at pretending to help the East with the so-called “Solidaritätszuschlag” fell far short of what was needed to compensate for this devastation.
So, it was too early to say “Good Bye, Lenin!”