Originally posted by: RamKiSeeta
We're talking about their rights over the throne before the dice game happened, as Duryodhana too gambled Hastinapura in the dice game, same as Yudhisthira. Only difference is that Yudi lost, but both of them gambled their respective kingdoms, so if we're going to blame one, then blame the other also. Duryodhana gambled everything that Yudhisthira gambled, which people seem to forget, including his own brothers, wife and wealth. He only did not lose because of Shakuni's cheating, otherwise he too may have lost some to Yudhisthira. So we cannot blame one and hail the other as a great King. If we take the dice game out of the quotient and judge solely based on how the epic describes their Kingship, then yes Yudhisthira was a superior King. You can read about why he was a good King during the whole chapter preceding the Rajasuya yagna, which describes how Yudhisthira turned the barren Khandavaprastha into a flouring kingdom with happy people.
Vidura was not selected as King, because he had even lesser claim than Pandu and Dhrit. Both Pandu and Dhrit were biological sons of the Queens of Hastinapura, so they had claim to the throne. Vidura on the other hand was neither the son of the King or Queen. So in reality he had no claim over the throne. Moreover, Pandu was elder to Vidura, so once they deemed him capable, he became King.
Dhrit never officially became King after Pandu's death. He was only the regent until Pandu's heirs returned to the Kingdom. Moreover, he ruled under Bhishma and Vidura's guidance as he could fight no wars or take no major decisions being blind. Same as he ruled under Duryodhana's guidance during the exile. So if we say Duryodhana was the unofficial King during exile, then Bhishma/Vidur were the unofficial Kings after Pandu's death. Dhrit merely sat on the throne, but he never really ruled in the true sense. He wasn't only blind, he was also politically incapable of taking any decisions as he was weak-minded. He was an incapable King both physically and politically.
So yes, as Pandu's eldest recognized son, Yudhisthira had greater claim to the throne, also because he was capable. Even IF we take Duryodhana to be capable, Yudhisthira was still elder to him, so out of all the capable heirs (including the other Pandavas and any 'capable' Kauravas), Yudhisthira was elder to them all.