this support for it had declined with the rise of BJP in the 90s when a whole lot of middle class got brainwashed with the ram mandir thing. now with nuke deal in the numerous surveys seen on tv done on urban city dwlling people, congress has regained its vote base in the cities. this will help them in the next elections. A congress win with 200 plus votes is not impossible. best thing would be congress gets 200 plus votes and also BJP in next elections and smaller regional parties are sidelined. this will create a good ruling party and opposition in indian parliament which will make India grow faster.
