Add missing identifiers to Barack Obama, Donald Trump and Mike Pence (#929)

* Add missing identifiers to Barack Obama, Donald Trump and Mike Pence

* dick cheney missing identifiers

* George Bush identifiers

executive.yaml

@@ -1446,6 +1446,9 @@
     thomas: '00193'
     govtrack: 402484
     icpsr: 14611
+    wikidata: Q48259
+    wikipedia: Dick Cheney
+    cspan: 9801
   name:
     first: Richard
     middle: Bruce
@@ -1467,6 +1470,8 @@
     how: election
 - id:
     govtrack: 412375
+    wikipedia: George W. Bush
+    wikidata: Q207
   name:
     first: George
     middle: Walker
@@ -1532,6 +1537,11 @@
     govtrack: 400629
     opensecrets: N00009638
     votesmart: 9490
+    wikidata: Q76
+    wikipedia: Barack Obama
+    google_entity_id: kg:/m/02mjmr
+    ballotpedia: Barack Obama
+    cspan: 55625
   name:
     first: Barack
     middle: Hussein
@@ -1563,6 +1573,8 @@
     icpsr: 20117
     wikidata: Q24313
     google_entity_id: kg:/m/022r9r
+    ballotpedia: Mike Pence
+    cspan: 85219
   name:
     first: Mike
     last: Pence
@@ -1582,6 +1594,10 @@
     fec:
     - P80001571
     wikipedia: Donald Trump
+    wikidata: Q22686
+    google_entity_id: kg:/m/0cqt90
+    ballotpedia: Donald Trump
+    cspan: 20967
   name:
     first: Donald
     middle: J.