(2a) Old politicians may have to listen to inexperienced ones
Too slow during his first two years as president when he had a majority in Congress as he tried to reach agreements with industrials and Republicans who opposed to be humiliated by a black man by agreeing on any reforms he suggested, even when he tried to involve them. And thus, he achieved little that is now reversed by the Republicans. He could have taken the opportunities the electorate gave him after his first election victory. Of course, he should have tried to reach agreement but he should quicker have accepted the opposite party didn't want any agreement with him. After 2 years he lost his majority.
He even found it difficult to condemn obvious violence against black people as he hoped (but failed) for approval of Republicans, mainly white men, of which many cold blooded supremacists.
And now it seems he lost his believe that change can (if the article is not fake news). Compare this with President Trump, whether you like his policies or not, he goes for what he believes and he achieves because he says he doesn't want to disappoint those who voted for him. That's what people wanted when they voted Mr Obama into power with his slogan "Yes, we can". He gave hope. Afterwards, we got President Trump.
And when he wasn't the Democratic nominee during the presidential elections, many people who voted for Mr Obama's during the previous two elections as they believed his slogan that change was possible, voted for Mrs Clinton while others either didn't vote or voted for the only person left to promise the jobless that he would defend jobs for Americans instead for Chinese and other places where workers are underpaid to maximise profits of a few; this man was Mr Trump. He won the presidential elections. The result, even old president Obama now seems to suggest that "Yes, we can" was not real as progress is by negotiating with those who don't want to negotiate.
My advice to the Democratic party members: go out and speak with ordinary people, also with people without or on low-paid jobs so you learn and you can find solutions. Further, study President Trump and tell yourself again "Yes, we can" and then do it when you have a majority although in a nicer way instead of wasting time negotiating the nonnegotiable so next time people will vote for someone who promises to achieve things, for the good or bad. No-one likes indecisive leaders who only negotiate. And if you fear that using your majority may result in more division, doing little or having too little time to implement the changes may result in the opponents winning elections as happened.
A better example is old PM Tony Blair who had new and fresh ideas that won him elections and, ones in power, he used his majority to change society for the better after PM Thatcher's years in power. But, as normal, he hardened over the years and is another example that he may speak but probably should not return into politics as he no longer believes in his original ideals or he would understand why Labour leader Jeremy Corbyn is not an extremist leader and may win, if there was no disastrous Brexit that messes with any logic.
Thus, the established politicians should stop saying that only those with experience know how to rule although can advise the inexperienced. If not, parties will start to fall apart as is happening, .