After the demise of the Prophet (PBUH&HF)...
After the demise of the Prophet (PBUH&HF), those who heed what the Messenger of Allah ordered them such as Ammar Ibn Yasir, Abu-Dhar al-Ghafari, Miqdad, Salman al-Farsi, Ibn Abbas, and others such as al-Abbas, Utbah Ibn Abi Lahab, Bara Ibn Azib, Ubay Ibn Ka'b, Sa'd Ibn Abi Waqqas ... etc., all gathered in the house of Fatimah (AS). Even Talha and al-Zubair were loyal to Imam Ali at the beginning and joint the others in the house of Fatimah (AS).
They assembled in the house of Fatimah as a place of refuge since they were opposing the majority of people. According to the authentic traditions in Sahih al-Bukhari, Umar confessed that the Imam Ali (AS) and his followers OPPOSED Abu Bakr. Al-Bukhari narrated: Umar said: "And no doubt after the death of the Prophet we were informed that the Ansar disagreed with us and gathered in the shed of Bani Sa'da.
'Ali and Zubair and whoever was with them, opposed us, while the emigrants gathered with Abu Bakr." Sunni Reference: Sahih al-Bukhari, Arabic-English, v8, Tradition #817 Other Sunni traditionists narrated that on the day of Saqifah: Umar said: "Ali Ibn Abi Talib, Zubair Ibn Awwam and those who were with them separated from us (and gathered) in the house of Fatimah, the daughter of the messenger of Allah." Sunni References: Ahmad Ibn Hanbal, v1, p55 Sirah al-Nabawiyyah, by Ibn Hisham, v4, p309 History of Tabari (Arabic), v1, p1822 History of Tabari, English version, v9, p192 Also: They demanded confirmation of the oath, but Ali and al-Zubair stayed away.
Al-Zubair drew his sword (from the scabbard), saying, "I will not put it back until the oath of allegiance is rendered to Ali." When this news reached Abu Bakr and Umar, the latter said, "Hit him with a stone and seize the sword." It is stated that Umar rushed (to the door of the House of Fatimah) and brought them forcibly while telling them that they must give their oath of allegiance willingly or unwillingly.
Sunni reference: History of al-Tabari, English version, v9, pp 188-189 Dear brother, let's just think a little! What kind of election was that?! Election implies choice and freedom, and that every Muslim has the right to elect the nominee. Whoever refuses to elect him does not oppose God or His Messenger because neither God nor His Messenger appointed the nominated person by people. Election, by its nature, does not compel any Muslim to elect a specific nominee.
Otherwise, the election would be coercion.