No, those are not the leaders. They are members of the so called peoples assembly. Pretty much alike to a parliament in most European countries. Except most European countries do not have a president in addition to a parliamentary leader, or prime minister as it is called. France is a notable exception. They have a prime minister and a president. The president is THE leader and the prime minister is irrelevant, alike to the the leader of house of representatives. They can also be considered leaders, but ofcourse, they arent really the leader of the country. Prime ministers and presidents are the single leaders.
Don't go thinking parliamentary democracy is better, it isn't. As soon as someone get a majority there, they can propose and pass anything that they please. They are pretty much given the power to dictate.
Yes, in theory the congress should have told the president to go **** himself many times. But unfortunately the congress no longer represent the people and they no longer perform their duty which is the act on behalf of the people and protect the constitution. Unfortunately the congress have turned into nothing less than a puppet of the parties and a playground for their fights against each others.
This scenario is pretty much the same in Europe, but under somewhat different rules. It always boils down to the same things. Two sides fighting for power, fighting against each others, neglecting the people, the noble single leaders, the election circus, lack of policies and integrity. Policies these days are sold to the cheapest bidders, be it corporations or election campaigns to sell it to people to gain votes. Once power is grabbed, election promises and actual policies are two entirely different worlds.
I would say anyone who don't see this are blind and dumb, but I don't want to generalise too much. But its obvious that this is what is going on, and I have no idea why some people are so blind that they do not see it. And what is even worse is that some people participate in it, not as free people, but as a slave of party politics and the manipulation and narrowing perspectives of their political elite.
As a result people are trapped in extremely narrow discussions about mostly irrelevant things, and completely miss all the important fundamental things that are going on. Many of the discussions on this forum is a clear evidence on that. While your politicians sell your rights to the lowest bidder, these people are busy bickering over which party is best, plague or cholera or twittering about the newest political celebrity.