In addition to lack of democracy in cong, there is leadership issues too. Cong seems to depend too much on Sonia, even the PM also. Thats a bad message to all people.
Also at the state level (some state), there is lack of a charismatic leader. I my state (OR), since last 10 years, its hard to find a good leader in cong, who can match NP. And the party is so disorganized, u will never feel to waste ur vote..