Since its inception in 2000, Uttarakhand has seen eight changes of occupants in the CM's office mainly due to internal squabbles and rebellion in the ruling party, be it the Congress or the BJP, or the high command at the Centre imposing its choice for the post of CM.
States like Uttarakhand and Jharkhand having small assemblies have faced political instability also because those planning to topple a government find it easier as only a few MLAs have to be won over to get the job done. Chhattisgarh though has been a rare exception.
PM Vajpayee had made Nityanand Swami the first CM of the interim government after the formation of Uttarakhand in 2000. Just 11 months later, he was replaced by BS Koshiyari, who stayed in office for three months before the first elections were called in 2002. Congress won in 2002 but the party high command chose veteran ND Tiwari as CM as it was not keen on giving the post to Harish Rawat. Tiwari being an astute politician who had also held the CM's post in undivided UP, ruled the state for five years.
In 2007, BJP tread a similar path. After winning Uttarakhand, the central leadership chose BC Khanduri as CM though Koshiyari reportedly had the support of a majority of the MLAs. Insiders then said Koshiyari's term as CM for three months in 2002 had not seen a clean government and hence the Rajput leader was overruled.
Though Khanduri was an honest CM, the strict no-nonsense ways of the former armyman antagonised many within the state BJP. Koshiyari sensed an opportunity and a rebellion ensued within two years and three months of Khanduri becoming the CM. Then BJP chief Rajnath Singh deputed senior leader Venkaiah Naidu to talk to the party MLAs to know their choice. RP Nishank was chosen as a compromise candidate on June 24, 2009.
Source Time of India