How can we effect a fundamental change in the Constitution to change this country for better?

Submitted for a NDTV debate/poll
Our political leaders are a mirror image of the society and a citizenry who the govern. After all it is for us that they are elected to the seats of power. However, over the last month or so, follies made by people like R R Patil ( Such small incidents happen in large cities), Vilasrao Deshmukh (RGVs Terror tour of Taj), A R Antulay ( Politicization of Karkare's death), Narendra Modi ( Monetary compensation to Karkare family), Achuthanandan (The Dog at Major Sandeep's house) and now Shekhar Tiwari ( behenji ki Salgira collection waale) put the political class in a very shameful light.
Are these people (who shamefully cover the spectrum of all parties in the land) educated and matured enough to understand the governance and a leadership as a subject?
Questions for debate:
Do you think it is time for a minimum education bar to be set for all MP/MLA contestants?
Do you think it is time to have yearly appraisals ( on websites/ other media) on how our leaders are delivering on their agenda that they promise during elections?
How can constitutional amendments sought to bring out these kind of significant changes in the India?