Texas is one state which runs its own exchange and has the highest number qualifying for federal subsidies.

This analysis also estimated that 29 million Americans could most probably shop on the federal exchange. According to the Congressional Budget Office 7 million would enroll in the first year and around 6 million of them would avail tax credits. Based on this new analysis by Kaiser, one quarter of potential enrollees would participate of which 35% would be eligible for tax credits.
There are many reasons as to why people who can get tax credits vary from state to state. One of the reasons is- the computer glitches which have discouraged many potential consumers. Kaiser research finds that states which have their own market place or exchange function much better as they have less start up difficulties. The federal government has 34 states with problems in their web sites. The states work much harder to reach out to people and encourage them to sign up for health insurance.
References:
Hannah Punitha (IRDA Licence Number: 2710062)
Michael Ollove, November 2013
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